Concrete pipe joint



4Patented May 25, 1937 Q UNITED STATES PATENT OFFICE CONCRETE PIPE JOINT Bozdar J.' Ukropna, Los Angeles, Calif.

Application February 26, 1936, Serial No. 65,808

. `'lllis'invention relates to improvement in concrete pipes.

The general object of the invention is to provide a Aconcrete pipie having an improved joint. F Y Another objectof the invention is to provide a concrete pipe including a plurality of lengths wherein impervious -rnembers are embedded between an inner layer and an outer layer of concrete, 'and wherein novel means is provided for providing a uidtight joint between lengths of the pipe. l Another object of the invention is to provide a concrete pipe joint wherein novel means is provided for initially sealing the joint prior to the caulking so that the inner surface of the pipe will not be wet when the pipe is laid ln a trench containing water.

An additional 'object of the invention is to provvide a concrete pipe including a plurality of 2 lengthsfeach of which includes a bell member and a spigot member made of metal and wherein the bell member includes a circular corrugation `which 'extends entirely around the end of the pipe to reinforce the same and also to provide a chamber in `conjunction with a spigot member.

Other objects and the advantages of the invention will be apparent from the following de- 'scription taken in connection with the accom- -panyinghdrawing wherein: 30 Fig. l is a side elevation showing a concrete pipe conduit 'including a plurality of lengths of pipe embodying `the features of my invention;

Fig.` 2" is an enlarged, fragmentary, section `showing a-completed joint between two lengths of Fig. 31s afview similar to Fig. 2 showing a modi- 'i'led form of my invention;

l Fig. 4 is aview similar to Fig. 2 showing a further modication of my invention; and

40 Fig, 5 is a sectional detail showing the initial sealing means. 1

AReferring to the drawing by reference charac- `ters I have indicated a concrete pipe embodying the features `of my invention generally at IU. As

45 shown this pipe comprises a plurality` of lengths II which are `preferably similar and which are provided with a spigot end I2 and a bell end I3.

l As shown eachlength of pipe includes an outer `layer of concrete I4 and an inner layer of con- 501crete I5 with a tubular, metal, reinforcing, memberf "I6` embedded between the inner and outer layers -of concrete. u l y "the spigot end of each length a tubular, metal, spigot, member jI1 issecured to the rein- LEli *forcing member lI6 as'by welding at I8 although `t Claims. (o1. 13s-85) the spigot member may be secured in any desirable manner. The spigot member is shown as cylindrical throughout its entire length and is provided with an end portion I9 which is rolled inwardly to provide an inwardly directed curved l flange 2li.

i 'I'he bell end is provided with a metal bell member 2l which includes a cylindrical portion 22 secured to the reinforcing member I6 by welding as at 22' and an integral outwardly ared portion 23, a cylindrical portion 24 and an inwardly flared portion 25 which terminates at 26 in an end face which is frusto-conicalin shape and is inclined at an` angle to the axis of the pipe length.

The outer layer of concrete I4 terminates at the bell end at 26' at a location ush with the end 2B of the bell member. The inner layer of concrete I5 at the spigot end terminates flush with theend of the ilange of the spigot member as indicated at 2l. The outer layer of concrete at the spigot end terminates at a location spaced from the end face 26 of the spigot member 2| as indicated at 29, while the inner layer of concrete of the bell end is set back and bevelled as at 3l! in line with the outwardly flared portion 23.

The outer diameter of the spigot member is slightly less than the inner diameter of the end face of the bell member so that the two may be easily assembled with the truste-conical end face of the bell member engaging and sliding along the curved ange 20 at the end of the spigot. The outer and the inner diameters of the spigot member are substantially the same Vas the outer and inner diameters, respectively, of the cylindrical portion 22 of the bell member.

After the parts are assembled as shown in Fig. 2 lead or other caulking material 3| `is inserted in the tapered portion of the space between the spigot member and the bell member and after this is tamped in place a lling of cement 32 is inserted to complete "the joint.

In Fig. 3 I show a modification of my invention as comprising a plurality of lengths 4I which are preferably similar and which are provided with a spigot end 42 and a bell end 43. As shown each length of pipe includes an outer layer of concrete 44 and an inner layer of concrete 45 with a tubular metal reinforcing member 46 inserted between the inner and outer layers.

A spigot member 41 is secured to the reinforcing member and isshown as cylindrical and as provided with an end portion 49 which is bent or flared inwardly.

The bell end is provided with a bell member 5| which includes a cylindrical portion 52 secured to the reinforcing member 46 and an outwardly flared portion 53, a cylindrical portion 54 and an inwardly flared portion 55 which terminates in an end cylindrical portion 56. The outer layer of concrete terminates at the bell end at 56 at a location flush with the plane end 56 of the bell member 5|, while the inner layer of concrete at the spigot end terminates ilush with the end 49 of the spigot member as indicated at 5T. The outer layer of concrete at the spigot end terminates at a location spaced from the end of the spigot member as indicated at 59, while the inner layer of concrete of the bell end is set back and bevelled as at 69 in line with the outwardly flared portion 53.

The outer diameter of the spigot member is slightly less than the inner diameter of the bell member so that the two may be assembled with the end of the bell member engaging the flared end portion 49 at the end of the spigot so that the parts may slide together readily. The outer and the inner diameters of the spigot member are substantially the same as the outer and inner diameters, respectively, of the cylindrical portion 52 of the bell member.

After the parts are assembled as shown in Fig. 3 lead or other caulking material 6| is inserted in the space between the spigot member and the bell member and after this is tamped in place a Ifilling of cement 62 is inserted to complete the joint.

' In Figs. 4 and 5 I show a modification which comprises a plurality of lengths '|I which are preferably similar and which are provided with a spigot end 12 and a bell end 13.

As shown each length of pipe includes an outer layer of concrete '|4 and an inner layer of concrete 'l5 with a tubular metal reinforcing member '|6 inserted between the inner and outer layers.

At the spigot end of each length a tubular spigot member 11 is secured to the reinforcing member 'I6 as by welding at '16. The spigot member is shown as cylindrical throughout its entire length and is provided with an end portion |9 which is bevelled inwardly as at 80.

The bell end is provided with a bell member 8| which includes a cylindrical portion 82 secured to the reinforcing member 'I6 and an outwardly ared portion 83, a cylindrical portion 84 and an inwardly flared portion 85 which terminates at 86 in an end which is bevelled and is inclined at an angle to the axis of the length'. The outer layer of concrete terminates at the bell end at B6 flush with the end 86 of the bell member, while the inner layer of concrete at the spigot end terminates flush with the end of the spigot member as indicated at 81. The outer layer of concrete at the spigot end terminates at a location spaced from the end of the spigot member as indicated at 89, while the inner layer of concrete of the bell end is bevelled as at 99 in line With the outwardly flared portion 83.

The outer diameter of the spigot member is slightly less than the inner diameter of the bell member so that the two may be assembled with the bevelled end portion 86 of the bell member vengaging the bevelled end 86 of the spigot so that After the parts are assembled as shown in Fig. 2 lead or other caulking material 9| is inserted in the space between the spigot member and the bell member and a filling of cement 92 is inserted to complete the joint.

At the end of the bevelled portion 86 a chamber 93 is provided between this portion, the end 89 of the outer layer of concrete |4 at the spigot end, and the spigot ring. (See Fig. 5.) A normally round caulking member 94 which may be a heavy rope or hawser 95 having asphaltum 96 thereon is arranged on the spigot member While the joint is being made and when the bell member is moved to the place the caulking member 94 is distorted and comforms to the shape of the chamber 93 to provide a temporary caulking toy exclude water from the pipe (when the latter is laid in a trench) prior to the insertion of the caulking 9|.

It will be noted that the bell members 2|, 5|, and 8 I, each provide a circular corrugation which extends around the entire pipe to form a chamber. As is well known, such a corrugation produces a stiffening effect and, as a result of my arrangement, the metal forming the bell is reinforced so that.it is not apt to be dented or distorted yet the facility with which the joint may be made is not impaired.

From the foregoing description it will be apparent that I have provided a novel pipe joint which can be economically manufactured and installed.

Having thus described my invention I claim:

1. A fluid conduit comprising a plurality of lengths of pipe, each of said lengths including a reinforcing tube, a bell member secured at one end to said tube and a spigot member secured at the other end to said tube,` said spigot member comprising a cylindrical tube having its extreme end portion inwardly curved to provide an inwardly directed flange arranged at right angles to the axis of the length, said bell member comprising a cylindrical portion engaging said reinforcing tube, an outwardly flaring portion connected to said cylindrical portion, a second cylindrical portion connected to said outwardly flared portion and an inwardly flared portion connected to said second cylindrical portion, said inwardly flared portion having its end face in frusto-conical form, the diameter of the inner periphery of said frusto-conical end face being slightly greater than the diameter of said spigot member to provide a sliding fit thereon, the inner diameter of said second cylindrical portion being greater than the outer diameter of the spigot member to provide a chamber, said spigot member terminating intermediate the ends of the chamber, a caulking material in the chamber surrounding said spigot member and a cement filling in the chamber at the end of said caulking material.

2. A fluid conduit comprising a plurality of lengths of concrete pipe, each'l of said lengths including a reinforcing tube, a bell member secured at one end to said tube and a spigot member secured at the other end to said tube, said spigot member comprising a cylindrical tube having its extreme end portion inwardly directed, said bell member comprising a cylindrical portion engaging said reinforcing tube, an outwardly flaring portion connected to said cylindrical portion, a second cylindrical portion connected to said outwardly flared portion and an inwardly flared portion connected to said second cylindrical portion, said inwardly ilared portion havingl its end face arranged at an angle to the axis of the bell member, the diameter of the inner periphery of said end face being slightly greaterthan the diameter of said spigot member to provide a sliding t thereon, the inner diameter of said second cylindrical portion being greater than theV outer diameter of the spigot member to provide a chamber, a caulking material in the chamber surrounding said spigot member and a cement filling in the chamber at the end of said caulking material.

BozIDAR Jl UKROPINA.. 

